Thanks for highlighting this major issue. I understand that there is nothing to do apart from specializing the traits for those particular std classes. This would however not work with user classes. As the beta is due on Monday, I believe it is too short to submit a working and tested patch. Maybe once the beta is out, you can start to work on a proposed contribution? Meanwhile, as suggested I will add a warning in the doc.
It's a tricky one, because strictly speaking vector<T> always does have an equality operator - it's just that depending upon T it may not compile :-( There's no general solution to this, because there's no way in the language to test whether something does or does not compile - we can only test whether it's declared or not. John.